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Message |
    
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 1641
Registered: 11-2001
| | Posted on Wednesday, March 12, 2008 - 12:37 pm: | 
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New For 1914
2 cycle no crankcase pressure !
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paulgray
Senior Member
Username: paulgray
Post Number: 56
Registered: 05-2003
| | Posted on Wednesday, March 12, 2008 - 07:55 pm: |
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Is it me or does that engine have a wipe timer like on a Tuttle??? |
richardday
Senior Member
Username: richardday
Post Number: 569
Registered: 11-2003
| | Posted on Wednesday, March 12, 2008 - 08:13 pm: |
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Any idea how this 2 stroke operated? |
Dickie Gibbens
Visitor
| | Posted on Thursday, March 13, 2008 - 10:03 am: |
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My guess is that a round rod is used connecting the piston to a cross head through a packing nut thus forming the chamber necessary for two cycle operation. A check valve allows outside intake air into the chamber. A connecting rod connects the cross head to the crankshaft. The engine looks tall enough to accommodate this system. Having an oil level, some crankccase lubrication quality is achieved, a sales pitch ensues! |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 1642
Registered: 11-2001
| | Posted on Thursday, March 13, 2008 - 10:27 am: |
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Paul
These external oscilating wiper timers I refer to as Tuttle timers too although a few other Engine Co's. used them, at least Dubrie put a cover over theirs to prevent snagging things and to shed water. Seems the Rialtos timer stuck way out and above the engine was either real handy to get to or was very vulnerable ??
DuBrie Timer
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Dick
This is one of those engines that has not shown up on any mfgrs list is not mentioned in Stans books or on Max's list- really lost in annuls of time, sort of a resurrection of the forgotten past with this post. I have been searching that patent date but no luck yet finding it.
I list in my data system about 8 different 2 stroke marine engs with open bases this one must be different design because of the patent ? It would be interesting to see a research article on these uniquely designed engs !
This was one of the better advertised engs around 1907, intersting that they claim to be the only open based 2 cycle eng - in one magazine their open based competion had an ad on the same page !
1907 Palmer-Moore
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 1643
Registered: 11-2001
| | Posted on Thursday, March 13, 2008 - 11:54 am: |
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Dickie
This is a great example of the design you explain above it's 1900-01.
I may have posted this before ?
Not able to attend this weekends festivities at J.B.'s, my daughter the youngest is getting married soon and an engagement party etc has conflicted, to try to sneak away for a few days would mean sleeping outside for awhile and I'm just getting to old for that !! Will miss the Bateau's, engines, great food, but most of all the wonderful people that get together there each year.
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john_archibald
Advanced Member
Username: john_archibald
Post Number: 50
Registered: 08-2006
| | Posted on Thursday, March 13, 2008 - 07:15 pm: |
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A friend of mine has given an explanation of how he thinks the Rialto engine works. I've copied in his remarks and will try also to post his graphic of the scheme.
Arch,
If memory serves correctly, the Rialto twin was a differential diameter
(or stepped piston) engine. The pistons have two diameters, a
conventional looking upper portion with a larger diameter lower portion.
The cylinder bores are also of double diameter to receive these pistons.
The larger portion of the piston is the scavenge pump, while the upper
part is the power piston. By arranging cylinders as a parallel twin,
the first cylinder's scavenge pump feeds the second power cylinder, and
vice-versa. With cylinders phased at 180 degrees, everything works
nicely. By isolating the scavenge pump from the crankcase, a plain
bearing, oil lubricated lower end can be used.
Dave
Archibald
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john_archibald
Senior Member
Username: john_archibald
Post Number: 51
Registered: 08-2006
| | Posted on Thursday, March 13, 2008 - 07:19 pm: |
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Here is the graphic for the suspected Rialto scheme.
Archibald |
miro
Senior Member
Username: miro
Post Number: 316
Registered: 11-2001
| | Posted on Thursday, March 20, 2008 - 05:12 pm: |
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The Caron engine ( Montreal) is a 2 cycle with a wet oil sump.
It has a long piston and 2 con rods outside the cylinder sleeve.
It was used in DisPro's. But eventually provided too expensive to manufacture competively.
miro |
billschaller
Senior Member
Username: billschaller
Post Number: 150
Registered: 12-2003
| | Posted on Thursday, March 27, 2008 - 07:44 pm: |
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this one has two pistons per cylinder, too.
as does this one.
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 1670
Registered: 11-2001
| | Posted on Friday, March 28, 2008 - 11:10 pm: |
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Penrose 1914
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